NEC NDA-24300 manual How to Control Switching Block

SYSTEM OPERATIONS

12.1.5How to Control Switching Block

The Switching Block denoted here includes the following system equipment:

•TSW (PH-SW12)

•MUX (PH-PC36)

•DLKC (PH-PC20)

•PLO (PH-CK16/17/16-A/17-A)

ATTENTION

Contents Static Sensitive

Handling Precautions Required

Perform the required system changeover by using the CMOD command or by operating the relevant key on the GT/PLO card. Refer to Table 6-9.

Table 6-9 Changeover of Switching Block

Type	Operations	Remarks
Speech Path Changeover by the	Use CMOD command.	All OPE or ACT lamps on the
CMOD command		Speech Path System, which were
		formerly active, go OFF.
		All OPE or ACT lamps on the
		Speech Path System, which were
Note	See Chapter 8.	formerly STBY, light steady-
		green.
Speech Path System Changeover by	On active GT card, turn MBR key UP.	All OPE or ACT lamps on the
Key Operation on the active GT card		Speech Path System, which were
	Return MBR key to original position (DOWN)	formerly active, go OFF.
	after OPE/MB lamp goes OFF on GT card.
		All OPE or ACT lamps on the
Note	See Section 12.1.6, Manual System Changeover	other side Speech Path System,
	of Speech Path System.	light steady-green.
PLO Changeover by Key Operation	On active PLO card, turn MBR key UP.	ACT lamp on the PLO card, which
		was formerly active, goes OFF.
	Return MB key to original position (DOWN)
	after ACT lamp goes OFF on PLO card.	ACT lamp on the PLO card, which
		was formerly STBY, goes steady-
Note	See Section 12.1.7, Manual System Changeover	green.
	of PLO.

Note: These operations cause a momentary interruption in speech paths. Since the interruption is momentary, it can be ignored as far as ordinary telephone calls are concerned. However, care should be take when data communications are involved, as the interruption might cause bit errors.

CHAPTER 6 NDA-24300

Page 466

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